<template>
	<view>
		<!-- 使用自定义的搜索组件 -->
		<view class="search-box">
			<my-search @click="gotoSearch"></my-search>
			
		</view>
		
		
		<view class="scroll-view-container">
			<!-- 左侧滑动区域 -->
			<scroll-view class="left-scroll-view" scroll-y="true" style="{height:wh +'px'};">
				<block v-for="(item,i) in cateList" :key="i">
					
					<view  :class="['left-scroll-view-item' ,i ===active ? 'active' : '']" @click="activeChanged(i)">{{item.cat_name}}</view>
				</block>
				
				
			</scroll-view>
			
			<!-- 右侧滑动区域 -->
			<scroll-view class="right-scroll-view" scroll-y="true" style="{height:wh +'px'};">
				
				<view class="cate-lv2" v-for="(item2,i2) in cateLevel2" :key="i2">
					<!-- 二级分类标题 -->
					<view class="cate-lv2-title">/ {{item2.cat_name}} /</view>
					<!-- 当前二级分类下的三级分类列表 -->
					<view class="cate-lv3-list">
						<!-- 三级分类的item项 -->
						<view class="cate-lv3-item" v-for="(item3,i3) in item2.children" :key="i3" @click="gotoGoodsList(item3)">
							<!-- 三级分类的图片 -->
							<image :src="item3.cat_icon" mode=""></image>
							<!-- 三级分类的文本 -->
							<text>{{item3.cat_name}}</text>
							
						</view>
						
					</view>
				</view>
			</scroll-view>
		</view>
	</view>
</template>

<script>
	export default {
		data() {
			return {
				//当前设备可用高度
				wh:0,
				cateList:[],
				active:0,
				//二级分类列表
				cateLevel2:[]
				
			};
		},
		onLoad() {
			// console.log('页面onLoad执行了！') 
			const sysInfo = uni.getSystemInfoSync()
			// console.log(sysInfo)
			this.wh= sysInfo.windowHeight-50
			this.getCateList()
		},
		methods:{
			//获取分类列表的数据
			async getCateList(){
				const {
					data:res
					} = await uni.$http.get('/api/public/v1/categories')
				if(res.meta.status !== 200) return uni.$showMsg()
				this.cateList = res.message
				// console.log(this.cateList)
				
				//为二级分类列表赋值
				this.cateLevel2 = res.message[0].children
				
				
			},
			activeChanged(i){
				this.active= i
				
				//重新为二级分类赋值
				this.cateLevel2 = this.cateList[i].children
			},
			//跳转到商品页面
			gotoGoodsList(item){
				uni.navigateTo({
					url:'/subpkg/goods_list/goods_list?cid=' + item.cat_id
				})
			},
			gotoSearch(){
				// console.log('ok')
				uni.navigateTo({
					url:'/subpkg/search/search'
				})
			}
		}
	}
</script>

<style lang="scss">
	.scroll-view-container{
		background-color: white;
		display: flex;
	}
	.left-scroll-view{
		width: 120px;
	}
	.left-scroll-view-item{
		background-color: gainsboro;
		line-height: 60px;
		text-align: center;
		font-size: 12px;
		
		&.active{
			background-color: white;
			position: relative;
		
		&::before{
			content:'';
			display:block;
			width:3px;
			height: 30px;
			background-color: hotpink;
			position:absolute;
			top:50%;
			left:0;
			transform: translateY(-50%);
			}
		}
	}
	
	.cate-lv2-title{
		font-size: 12px;
		font-weight: bold;
		text-align: center;
		padding:15px 0;
	}
	.cate-lv3-list{
		display: flex;
		flex-wrap: wrap;
		
		
		.cate-lv3-item{
			width: 33.33%;
			display: flex;
			flex-direction: column;
			justify-content: center;
			align-items: center;
			image{
				width: 60px;
				height: 60px;
			}
			text{
				font-size: 16px;
			
			}
		}
	}
	.search-box{
		//设置定位效果为“吸顶”
		position: sticky;
		//吸顶的位置
		top:0;
		//提高层级，防止被轮播图覆盖
		z-index: 999;
	}
</style>
